Flaw Shape Reconstruction from SH-Wave Array Ultrasonic Data Using Time Domain Linearized Inverse Scattering Method

Journal Article · Sat Apr 09 04:00:00 EDT 2005 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.1916760· OSTI ID:20655394

Kimoto, K; Hirose, S ^[1]

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1. Department of Mechanical and Environmental Informatics, Graduate School of Information Science and Engineering, Tokyo Institute of Technology 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552 (Japan)

A linearized inverse scattering method, so called the Kirchhoff inversion, is formulated in time domain for SH-waves measured by a contact ultrasonic transducer and tested using experimental data. The data for reconstruction are experimentally obtained by measuring ultrasonic echoes from artificial flaws in steel plate specimens. For an efficient and accurate data collection, a contact SH-wave linear array transducer is used. The shapes of the artificial flaws are reconstructed by the Kirchhoff inversion and the conventional SAFT (Synthetic Aperture Focusing Technique) using the waves from a single ray path. Comparison of the two methods shows that the Kirchhoff inversion works well for experimental data and outperforms SAFT although only an illuminated portion of the flaw boundaries is reconstructed by either method. In order to gain more information on the flaw boundaries, the Kirchhoff inversion which takes into account multiple ray paths is also tested with the same experimental data. As a result, it is shown that a larger part of the flaw boundaries can be visualized by considering the multiple ray paths.

• OSTI ID: 20655394
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 760; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
COMPARATIVE EVALUATIONS
DEFECTS
DETECTION
EXPERIMENTAL DATA
FOCUSING
IMAGE PROCESSING
INVERSE SCATTERING PROBLEM
PLATES
RADAR
SCATTERING
SHAPE
STEELS
TRANSDUCERS
ULTRASONIC TESTING